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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6082f008a3f5bd8bcea2cd764b558d77885bdf44988a41c1572cf5585ea8020e' 
  AND token = 'R91tq8bPm8QYkfhZqJZhrelSPnv45OBmtf9lz85qK3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}